The poo stains left in your underware. Caused by not wiping your ass, not wiping your ass enough, or having a bubbler or shart in the middle of the day. The appearance is similar to the starting area of a drag racing strip, or the "wheels down" area on a runway.

Husband: Sweetie pie honey bunny, these underware are going to need some "special" attention.
Wife: My god, whats up with the racing stripe?
Husband: Had a bubbler after my Taco Bell lunch today.

Two or three lines shaved into the side of the head just above the ear. This hairstyle has been observed on prominent figures throughout history such as Vanilla Ice, Wesley Snipes, and your little brother whose idol is "Dirty" Dale Earnhardt,

Little Bobby's been askin' for some "racing stripes" shaved into his head because all the fellers at school got em.